1327670 九、發明說明： 【發明所屬之技術領域】 • 本發明係關於一種用於液晶顯示裝置之光學板及採用 -該光學板之直下式背光模組。 【先前技術】 由於液晶顯示裝置面板之液晶本身不具發光特性，因 而，爲達到良好之顯示效果，需給液晶顯示裝置面板提供一 面光源裝置，如背光模組，其功能在於向液晶顯示裝置面板 供應亮度充分並且分佈均勻之面光源。 依背光源之位置不同，背光模組一般可分爲側光式和直 下式兩種。側光式背光模組之光源設置於背光元件之側面， 其具有輕、薄及耗電低等優點，廣泛應用於中小尺寸之液晶 顯示裝置，如PDA、移動電話等。直下式背光模組之光源設 置於液晶顯示面板之正下方，其具有較高之亮度，多用於監 視器及液晶電視等大型顯示設備。 請參閱圖1，一種習知之直下式背光模組10,其包括複 數燈源11，一反射板12，一擴散板13，一棱鏡片14及兩擴 散片15。該複數燈源11置於反射板12上，該擴散板13、 擴散片15、棱鏡片14、另一擴散片15依次疊合於反射板12 之上方。擴散板13 —般由聚碳酸脂製成之透明基體131及 散佈於該透明基體131中具有散射作用之甲基丙烯酸甲酯顆 粒132構成，其用於將從燈源11出射之光線發散，並具有 支撐其他光學膜片之功能。棱鏡片14通過於其表面設置微 三棱鏡結構，使原本散亂之光線集中至正前方約70度之範 7 圍内出射，可提升直下式背光模組1〇特定視角範圍内之亮 度。擴散片15 -般通過在高透光性膜片i5i上塗佈 墨W製成，其可將光線進—步散射，從而提高 ^ -光模組之出光均勻性。 八月 然，當該直下式背光模組10之擴散板13與燈源 距離較近時，擴散板13上鄰近燈源u區域之光強要大 之光強，此時，遠離燈源u區域之光 充/刀政射’但擴散板13上鄰近燈源u區域之光線不能充分 散射’將導致擴散板13上鄰近燈源u之區域亮度過高，广 而造成背光额1G之光學均勻性不佳。爲了提高光學 ^ 13 !3 . 1距離’但⑽將使整個直下式背錢組10之厚 度增大。 予 另，儘管該擴散板13’擴散片15及稜鏡片“之間相互 緊挽接觸’但其相互之間之介面仍有較細微之空氣阻^声 光線在該擴散板13,擴散片15及稜鏡片14之間進行傳同播曰時 ㈣面容㈣生介面反射’從而容易造成光能量消 耗舁損失，使光能量之利用率降低。 【發明内容】 有鑒於此’提供—種具有較佳光學均勻性以及較佳光 能量利用率’並可滿足組裝薄型化背光模組要 $ 及採用該光學板之背光模組實爲必要。 予板 -種光學板，其包括一透明基體’該透明基體包括一入 面以及-與該入光面相對之出光面，該入光面形成有複數 8 1327670 點狀凹槽及填充於該複數點 包括透明mm ㈣&之擴放層’所述之擴散層 =透月g基材’以及摻料該透㈣ *射粒子與第二散射粒子， ^ τ之弟政 -散射粒子之折射率。 '弟一 射板：：ΐ:式模組’其包括一反射板;複數設置於反 括 "、’ 一设置於反射板上方之光學板，該光學板包 :=一對之出光面，該入光面形成有與二 ’、士^之複數點狀凹槽及填充於該複數點狀凹槽之擴散 層I所述之擴散層包括透明频基材，以及摻雜於該透明樹 ι基材中H㈣子與第二散射粒子’該第—散射粒子 之折射率小於第二散射粒子之折射率。 域 另 度 片 用 相較於習知技術，所述光學板之點狀凹槽相對光源設 置，擴散層填充於其中，當光學板與光源相距較近時，該^ 散層也可將光學板上鄰近光源之光強較大區域之光線充分 ，散’且ϋ可通過擴散層厚度之變化，對％強有差異之區域 實行不同程度之散射，從而避免光學板上出現亮度過高之區 A·同時實現使用該光學板之直下式背光模組之薄型化， 由於該光學板内設置有擴散層，且具有足夠之結構強 因此其可取代習知直下式背光模組中之擴散板及擴散 起到散射光線，提高直下式背光模組出光均勻性之作 由於其將習知技術之複數光學板整合於一起，減少了光 線需穿透之光學介面，從而減少了光線在通過該光學板時介 面反射之能量損失’從而提高該背光模組之光能利用率。 9 1327670 【實施方式】 下面將結合附圖和複數實施例對本發明之光學板及採 用该光學板之直下式背光模組作進一步之詳細說明。 '請麥閱圖2，本發明具體實施例提供一種光學板2〇，其 包括一透明基體21，該透明基體21包括一入光面211以及 一與該入光面211相對之出光面212，該入光面211形成有 複數呈陣列分佈之點狀凹槽213，以及填充該複數點狀凹槽 之擴散層22。 透明基體21爲一方形平板，其由聚碳酸酯、聚曱基丙 稀酸甲酯、聚笨乙烯及曱基丙烯酸甲酯苯乙烯共聚物中之一 種或一種以上之混合物製成。該透明基體21需有較強之結 構強度，具體可通過增加該透明基體21之厚度Η來實現， 例如，其厚度Η可爲1.5〜3毫米。 ' 請同時參閱圖3，每個點狀凹槽213爲一中間深度要大 於四周深度之軸對稱結構。每個點狀凹槽213可選擇爲錐形 槽、圓臺形槽、正稜臺形槽、球形槽，本實施例中之複數點 狀凹槽213分別爲圓臺形槽。爲使該透明基體21之結構強 度不被過多削弱’該點狀凹槽213之中心深度h與透明基體 21之厚度Η之比小於〇.3。 該擴射層22用於使進入該光學板2〇之光線擴散均勻。 該擴射層22由透明樹脂224及散佈於該透明樹脂224中之 第一散射粒子221、第二散射粒子222構成。該透明樹脂224 可爲丙烯酸樹脂、丙烯酸氨基樹脂及環氧樹脂中之一種或一 種以上之混合物。 丄J厶/u/vy =❹子221之折射率Π1—般設^在〗 •間，例如该第一散射粒子221 之 ,稀酸甲醋難、破璃微珠馳㈣粒、聚甲基丙 .‘以上之混合物，顆粒中之一種或-種 閱圖4，該第一散射粒 主5〇 I卡之間。請參 ,.,, 子221可使入射光線發生多重嵛鼾鱼 =散射粒子222爲不透明顆粒，其折 射Γ子221要大（…，其優選範圍爲2至2.8):如ί 一放射粒子222可爲由二氧化鈦 苐 顆物鈦肋、硫酸鋇顆粒、硫酸鋅 :拉、乳化辞顆粒及碳酸辄粒中之―種或一 ： 過㈣倣木至1微未之間。請參閱圖5,經 第222之光線一部分發生繞射，從而繞過該 回原^=^___21’另—部分光線被反射 在該擴射層22中’該透明樹脂224之重量百分含量可 ’該第一散射粒子221與第二散射粒子222之重 :二=之和可爲•另外，該第一散射粒子221 ;弟一政射粒子222之重量百分含量之比可爲5〜1〇〇。通過 =一散射粒子222重量之設置，可設定該光學板之穿 边率。 在该擴散層22中，第一散射粒子221可使光線發生多 散射與折射’該第二散射粒子222處於第—散射粒子221 巧’具有促進該第—散射粒子221分散均勻之作用。又， 該第二散射粒子222對光線具有反射與繞射作用，使得未能 11 1327670 被苐放射粒子221擴散之氺娩 粒子？99 c; 6 '之先線，遏可進一步被該第二散射 ，子22反射或繞射至不同處，繼 •擴散；或光線被反射⑽政射粒子221 •板組中之反射板反射’又丹被月光 之方4 進入5玄擴放層22,而通過同樣 破擴散。因此’該具有第一散射粒子221與第二 政射叔子222之擴散層22,可易 4α诂十士 J勿π便入射先均勻擴散。而習 之擴散板由於只具有第—散射粒子，對光線之散射 不及本實施例中光學板之散射層，故該散射層^可 取代¥知技術中擴散板與擴散片，對人射光進行均勻擴散。 該，射層22還包括第三散射粒子223。該第三散射粒子 223,可^光粉顆粒’其可吸收光線中之紫外線並轉化爲可 見光。該第三散射粒子223之總重量與第—散 總重量之比小於0.01。 1之 請同時參閱圖2及圖6，該透明基體21之出光面212 返形成有複數呈陣列狀排佈之球面微稜鏡23，該球面微稜鏡 23由射出成型或壓縮成型或滾壓成型或射出壓縮同步成型 製成，該球面微棱鏡23可間隔一定距離，也可緊密相連。 由於球面微稜鏡23之設置，從出光面212出射之光線將向 出光面212之正前方會聚，從而使該光學板2〇進一步整人 有稜鏡片之功能。可以理解’該出光面也可以是形成其他具 有聚光作用之微稜鏡’例如連續分佈之V型微稜柱，同樣可 使該光學板整合有棱鏡片之功能。 本實施例中之光學板20由於在透明基體21之入光面 211設置點狀凹槽213 ’並於該點狀凹槽213中填充有換么隹 12 1327670 第一散射粒子221、第二散射粒子222及第三散射粒子223 之擴散層22，使得進入該光學板20之光線得以均勻擴散， '因此可避免光源照射時，在該光學板20上出現亮度過高之 •區域，此外，通過在透明基體21之出光面212設置微棱鏡 23，可使該光學板20進一步具備棱鏡片之聚光功能。由於 該光學板20將習知技術中之擴散板、擴散片及棱鏡片之功 能一體化，可實現使用該光學板20之背光模組薄型化，且 光線在該光學板20中傳輸將不會出現介面反射等能量損 失，從而可提高光線之利用率。 請參閱圖7,本發明還提供一種採用上述光學板20之直 下式背光模組30，其包括一反射板31 ;複數設置於反射板 31上之光源32 ; —設置於反射板31上方之光學板20。 該光學板20之入光面211與反射板31相對，該入光面 211上之點狀凹槽213與反射板31上之光源32相對。本實 施例中之光源32爲LED燈源，且每兩光源32之距離D要 大於點狀凹槽213之寬度d。由於擴散層22填充於該點狀凹 槽213中，每個擴散層22也爲中間厚、四周薄之結構，這 樣可縮小正對擴散層22之入射光線與斜射入擴散層22中之 光線之光程差，從而使正對點狀凹槽213之入射光線也經過 較多之反射與折射，提升從擴散層22出射光線之均勻性。 光線經擴散層22散射後，光線得以均勻化，再經光學 板20之球面微棱鏡23，可使原本散亂之光線進行會聚後射 出，因此，該光學板20可提升直下式背光模組30之出光均 勻性及正面亮度。 13 1327670 綜上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟，以上所述者僅為本發明之較佳實施方式，本發明 义範圍並不以上述實施例為限，舉凡熟習本案技藝之人士援 •依本發明之精神所作之等效修飾或變化，皆應涵蓋於以下申 請專利範圍第内。 【圖式簡單說明】 圖1是習知直下式背光模組之剖面示意圖。 圖2是本發明光學板實施方式之剖面示意圖。 圖3是圖2所示光學板去除擴散層後之透明基體之立體 示意圖。 圖4是第一散射粒子對光線進行散射之光路示意圖。 圖5是第二散射粒子對光線進行反射與繞射之光路示 意圖。 圖6是本發明光學板實施方式之立體示意圖。 圖7是本發明直下式背光模組實施方式之示意圖。 【主要元件符號說明】 (本發明） 光學板 20 透明基體 21 擴散層 22 球面微稜鏡 23 入光面 211 出光面 212 點狀凹槽 213 第一散射粒子 221 第二散射粒子 222 第三散射粒子 223 透明樹脂 224 直下式背光模組 30 反射板 31 光源 32 14 1327670 習知） 直下式背光模組 10 燈源 11 反射板 12 擴散板 13 棱鏡片 14 擴散片 15 透明基體 131 曱基丙烯酸曱酯顆粒 132 膜片 151 油墨 152 151327670 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical plate for a liquid crystal display device and a direct type backlight module using the same. [Prior Art] Since the liquid crystal of the panel of the liquid crystal display device does not have a light-emitting property, in order to achieve a good display effect, it is necessary to provide a light source device such as a backlight module to the liquid crystal display device panel, and its function is to supply brightness to the liquid crystal display device panel. A fully and evenly distributed surface source. Depending on the position of the backlight, the backlight module can be generally divided into two types: side light type and direct type. The light source of the edge-lit backlight module is disposed on the side of the backlight element, and has the advantages of lightness, thinness, and low power consumption, and is widely used in small and medium-sized liquid crystal display devices such as PDAs and mobile phones. The light source of the direct type backlight module is disposed directly under the liquid crystal display panel, and has high brightness, and is mostly used for large display devices such as monitors and LCD TVs. Referring to FIG. 1, a conventional direct type backlight module 10 includes a plurality of light sources 11, a reflection plate 12, a diffusion plate 13, a prism sheet 14, and two diffusion sheets 15. The plurality of lamp sources 11 are placed on the reflector 12, and the diffusion plate 13, the diffusion sheet 15, the prism sheet 14, and the other diffusion sheet 15 are sequentially superposed on the reflection plate 12. The diffusion plate 13 is generally composed of a transparent substrate 131 made of polycarbonate and a methyl methacrylate particle 132 dispersed in the transparent substrate 131 and having a scattering effect, and is used for diverging light emitted from the light source 11 and Has the function of supporting other optical films. The prism sheet 14 is provided with a microtriangular structure on its surface, so that the originally scattered light is concentrated to a range of about 70 degrees in front of it, which can improve the brightness of the direct type backlight module 1 within a specific viewing angle range. The diffusion sheet 15 is generally formed by coating the ink W on the highly transparent film i5i, which can scatter the light in a stepwise manner, thereby improving the light uniformity of the light module. In August, when the diffuser plate 13 of the direct-type backlight module 10 is closer to the light source, the light intensity of the diffuser plate 13 adjacent to the light source u region is greater, and at this time, away from the light source u region. The light charge/knife shot 'but the light on the diffuser plate 13 adjacent to the light source u region cannot be sufficiently scattered' will cause the brightness of the region adjacent to the light source u on the diffuser plate 13 to be too high, and the optical uniformity of the backlight amount 1G is not wide. good. In order to increase the optical ^ 13 !3 .1 distance ', but (10) will increase the thickness of the entire direct-type back money group 10. In addition, although the diffusion plate 13' diffusion sheet 15 and the cymbal sheet "closely contact each other", the interface between them is still finer in the air, and the diffusion sheet 15 and the diffusion sheet 15 are When the cymbal 14 is transmitted in the same manner, (4) the face (4) the interface reflection ', which is easy to cause loss of light energy consumption, and the utilization of the light energy is lowered. [Invention] In view of this, the invention provides a better optical Uniformity and better light energy utilization' and can meet the requirements of assembling a thinned backlight module and a backlight module using the optical plate. A plate-type optical plate comprising a transparent substrate 'the transparent substrate Including an entrance surface and a light-emitting surface opposite to the light-incident surface, the light-incident surface is formed with a plurality of 8 1327670 dot-shaped grooves and a diffusion layer filled in the complex layer including the transparent mm (four) & = through the moon g substrate 'and the admixture of the four (four) * shot particles and the second scattering particles, ^ τ of the divergence - scattering particles of the refractive index. 'Day a shot board:: ΐ: modular module' which includes a Reflector; plural is set in reverse " An optical plate disposed above the reflector, the optical plate includes: a pair of light-emitting surfaces, the light-incident surface is formed with a plurality of dot-shaped grooves of the two's, and the plurality of dot-shaped grooves are filled The diffusion layer of the diffusion layer I includes a transparent frequency substrate, and the H(tetra) and the second scattering particles doped in the transparent tree substrate have a refractive index smaller than that of the second scattering particles. Compared with the prior art, the dot-shaped groove of the optical plate is disposed opposite to the light source, and the diffusion layer is filled therein. When the optical plate is close to the light source, the optical layer can also be used for the optical plate. The light with a large intensity near the light source is sufficient, and the scatter can be scattered to different extents by varying the thickness of the diffusion layer, thereby avoiding the area of excessive brightness on the optical plate. · Simultaneously realize the thinning of the direct type backlight module using the optical plate. Since the optical plate is provided with a diffusion layer and has sufficient structure, it can replace the diffusion plate and diffusion in the conventional direct type backlight module. Play Light, which improves the uniformity of light output of the direct-lit backlight module, because it integrates the plurality of optical plates of the prior art, reduces the optical interface through which the light needs to be penetrated, thereby reducing the reflection of light when passing through the optical plate. The energy loss is increased to improve the light energy utilization rate of the backlight module. 9 1327670 Embodiments The optical plate of the present invention and the direct type backlight module using the same are further described in detail below with reference to the accompanying drawings and the embodiments. In the embodiment of the present invention, an optical plate 2 includes a transparent substrate 21, and the transparent substrate 21 includes a light incident surface 211 and a light emitting surface opposite to the light incident surface 211. 212. The light incident surface 211 is formed with a plurality of dot-shaped grooves 213 distributed in an array, and a diffusion layer 22 filling the plurality of dot-shaped grooves. The transparent substrate 21 is a square plate made of one or a mixture of polycarbonate, polymethyl methacrylate, polystyrene, and methyl methacrylate styrene copolymer. The transparent substrate 21 needs to have a strong structural strength, and can be specifically achieved by increasing the thickness Η of the transparent substrate 21. For example, the thickness Η can be 1.5 to 3 mm. Please also refer to Fig. 3, each of the dot-shaped grooves 213 is an axisymmetric structure having an intermediate depth greater than the peripheral depth. Each of the dot-shaped grooves 213 can be selected as a tapered groove, a truncated-shaped groove, a positive-arc-shaped groove, and a spherical groove. The plurality of dot-shaped grooves 213 in this embodiment are respectively truncated-shaped grooves. In order to prevent the structural strength of the transparent substrate 21 from being excessively weakened, the ratio of the center depth h of the dot-like recess 213 to the thickness Η of the transparent substrate 21 is less than 〇.3. The diffusing layer 22 serves to spread the light entering the optical plate 2 evenly. The diffusion layer 22 is composed of a transparent resin 224 and first scattering particles 221 and second scattering particles 222 dispersed in the transparent resin 224. The transparent resin 224 may be one or a mixture of one or more of an acrylic resin, an acryl amino resin, and an epoxy resin.丄J厶/u/vy=The refractive index of the scorpion 221 is generally set to 〗1, for example, the first scattering particle 221, the dilute acid vinegar is difficult, the broken glass microbeads (four) granules, polymethyl C. 'The above mixture, one of the particles or - see Figure 4, the first scattering particle between the main 5〇I card. For example, the sub-221 can cause multiple incidents of incident light rays. The scattering particles 222 are opaque particles, and the refractive dice 221 is large (..., preferably ranges from 2 to 2.8): such as a radiation particle 222 It may be between titanium dioxide ribs, barium sulfate particles, zinc sulfate: pull, emulsified particles and strontium carbonate particles or one: between (four) imitation wood and 1 micro. Referring to FIG. 5, a part of the light of the 222th light is diffracted, thereby bypassing the returning original ^=^___21', and another part of the light is reflected in the diffusing layer 22, 'the weight percentage of the transparent resin 224 can be 'The weight of the first scattering particle 221 and the second scattering particle 222: the sum of the two = may be • In addition, the ratio of the weight percentage of the first scattering particle 221 to the political particle 222 may be 5 to 1 Hey. By the setting of the weight of the scatter particle 222, the edge ratio of the optical plate can be set. In the diffusion layer 22, the first scattering particles 221 cause the light to be scattered and refracted. The second scattering particles 222 are in the first scattering particles 221, and have the effect of promoting uniform dispersion of the first scattering particles 221. Moreover, the second scattering particles 222 have a reflection and diffraction effect on the light rays, so that the particles that fail to be diffused by the xenon radiation particles 221 are not 11 1327670? 99 c; 6 'the first line, the suppression can be further reflected by the second scattering, the sub- 22 is reflected or diffracted to different places, followed by • diffusion; or the light is reflected (10) the political particles 221 • the reflection of the reflector in the plate group' Dan was also entered into the 5 Xuan expansion layer 22 by Moonlight Square 4, and passed through the same diffusion. Therefore, the diffusion layer 22 having the first scattering particles 221 and the second political uncle 222 can be uniformly diffused first. However, since the diffusion plate has only the first scattering particles and the scattering of the light is not as good as the scattering layer of the optical plate in the embodiment, the scattering layer can replace the diffusion plate and the diffusion sheet in the prior art, and uniformize the human light. diffusion. The shot layer 22 also includes third scattering particles 223. The third scattering particles 223, which are capable of absorbing ultraviolet rays in the light and converting them into visible light. The ratio of the total weight of the third scattering particles 223 to the total weight of the first dispersion is less than 0.01. Referring to FIG. 2 and FIG. 6 at the same time, the light-emitting surface 212 of the transparent substrate 21 is formed with a plurality of spherical micro-23s arranged in an array, and the spherical micro-23 is formed by injection molding or compression molding or rolling. The molding or injection compression molding is performed, and the spherical microprisms 23 can be spaced apart or closely connected. Due to the arrangement of the spherical micro-twist 23, the light emerging from the light-emitting surface 212 will converge toward the front side of the light-emitting surface 212, thereby allowing the optical plate 2 to further function as a cymbal. It can be understood that the illuminating surface may also be a V-shaped microprism which forms other micro-stimuli having a collecting effect, for example, a continuous distribution, and the optical sheet can also be integrated with the function of the prism sheet. The optical plate 20 in this embodiment is provided with a dot-shaped groove 213 ′ in the light-incident surface 211 of the transparent substrate 21 and is filled with the first scattering particle 221 and the second scattering in the point-shaped groove 213 . The diffusion layer 22 of the particles 222 and the third scattering particles 223 allows the light entering the optical plate 20 to be uniformly diffused, so that when the light source is irradiated, an area where the brightness is too high appears on the optical plate 20, and further, The microprism 23 is provided on the light-emitting surface 212 of the transparent substrate 21, and the optical plate 20 can further be provided with a condensing function of the prism sheet. Since the optical plate 20 integrates the functions of the diffusion plate, the diffusion sheet and the prism sheet in the prior art, the backlight module using the optical plate 20 can be made thinner, and the light transmitted in the optical plate 20 will not be transmitted. Energy loss such as interface reflection occurs, thereby improving the utilization of light. Referring to FIG. 7, the present invention further provides a direct type backlight module 30 using the above optical plate 20, which comprises a reflecting plate 31, a plurality of light sources 32 disposed on the reflecting plate 31, and an optical device disposed above the reflecting plate 31. Board 20. The light incident surface 211 of the optical plate 20 is opposed to the reflective plate 31, and the dot-shaped recess 213 on the light incident surface 211 is opposed to the light source 32 on the reflective plate 31. The light source 32 in this embodiment is an LED light source, and the distance D of each of the two light sources 32 is greater than the width d of the dot-shaped recess 213. Since the diffusion layer 22 is filled in the dot-shaped recesses 213, each of the diffusion layers 22 is also a structure having a thick intermediate portion and a thin periphery. This can reduce the incident light rays that are directly opposite to the diffusion layer 22 and the light that is obliquely incident into the diffusion layer 22. The optical path difference is such that the incident light rays directly facing the dot-shaped grooves 213 are also more reflected and refracted to enhance the uniformity of the light emitted from the diffusion layer 22. After the light is scattered by the diffusion layer 22, the light is homogenized, and then the spherical microprism 23 of the optical plate 20 can be used to converge the originally scattered light, so that the optical plate 20 can raise the direct-type backlight module 30. Light uniformity and front brightness. 13 1327670 In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be able to modify the equivalent modifications or variations according to the spirit of the present invention. All should be covered in the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a conventional direct type backlight module. Figure 2 is a schematic cross-sectional view showing an embodiment of an optical plate of the present invention. Figure 3 is a perspective view of the transparent substrate after the diffusion layer of Figure 2 is removed. 4 is a schematic diagram of an optical path in which first scattering particles scatter light. Fig. 5 is an optical path diagram in which the second scattering particles reflect and diffract light. Figure 6 is a perspective view of an embodiment of an optical plate of the present invention. 7 is a schematic diagram of an embodiment of a direct type backlight module of the present invention. [Description of main component symbols] (Invention) Optical plate 20 Transparent substrate 21 Diffusion layer 22 Spherical micro-small 23 Light-incident surface 211 Light-emitting surface 212 Dot-shaped groove 213 First scattering particle 221 Second scattering particle 222 Third scattering particle 223 Transparent Resin 224 Direct Backlight Module 30 Reflector 31 Light Source 32 14 1327670 Conventional Direct Backlight Module 10 Light Source 11 Reflector 12 Diffuser 13 Prism Sheet 14 Diffuser 15 Transparent Substrate 131 Mercapto Acrylate 132 diaphragm 151 ink 152 15